class Vovel :
    def __getattr__(self, name) :
        for a in name :
            if a != "a" and a != "e" and a != "y" and a != "u" and a != "i" and a != "o" :
                raise AttributeError(self.__class__.__name__ + " instance has no attribute " + "\'" + name+ "\'")
                break;
        else :
            return name.upper()
            

        